/
main.go
133 lines (110 loc) · 2.69 KB
/
main.go
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package main
import (
"fmt"
"os"
"strconv"
"github.com/docopt/docopt-go"
)
const terminals = ".!?\n"
var usage = `Markov Chains.
Usage:
markov from (db <db> | file <file>) generate <num> [options]
markov into <db> parse <file>... [options]
markov -h | --help
markov --version
Options:
-h, --help Show this screen.
--version Show the version.
-m NTOK, --min-tokens NTOK Minimum number of tokens in generated lines. [default: 20]
-r RANK, --rank RANK Rank of markov chain. [default: 2]`
func main() {
opts, err := docopt.Parse(usage, nil, true, "Markov 0.1", false)
if err != nil {
fmt.Println(err)
return
}
switch {
case opts["from"].(bool):
generate(opts)
case opts["into"].(bool):
parse(opts)
}
}
func generate(opts map[string]interface{}) {
mintok, err := strconv.Atoi(opts["--min-tokens"].(string))
if err != nil {
fmt.Printf("--min-tokens should be an integer value")
os.Exit(-1)
}
rank, err := strconv.Atoi(opts["--rank"].(string))
if err != nil {
fmt.Print("--rank should be an integer value\n")
os.Exit(-1)
}
ngens, err := strconv.Atoi(opts["<num>"].(string))
if err != nil {
fmt.Print("<num> should be an integer value\n")
os.Exit(-1)
}
var dbfile string
if opts["db"].(bool) {
dbfile = opts["<db>"].(string)
} else {
dbfile = ":memory:"
}
db, err := OpenDB(dbfile)
if err != nil {
fmt.Printf("failed to open database [%s]: %s\n", opts["<db>"], err)
os.Exit(-1)
}
m := NewMarkov(rank, terminals, db)
if opts["file"].(bool) {
fnames := opts["<file>"].([]string)
parseFiles(m, fnames)
}
for i := 0; i < ngens; i++ {
line, err := m.Generate(mintok)
if err != nil {
fmt.Printf("error generating from chain: %s\n", err)
os.Exit(-1)
}
fmt.Println(line)
}
}
func parse(opts map[string]interface{}) {
rank, err := strconv.Atoi(opts["--rank"].(string))
if err != nil {
fmt.Print("--rank should be an integer value\n")
os.Exit(-1)
}
db, err := OpenDB(opts["<db>"].(string))
if err != nil {
fmt.Printf("failed to open database [%s]: %s\n", opts["<db>"], err)
os.Exit(-1)
}
m := NewMarkov(rank, terminals, db)
fnames := opts["<file>"].(string)
parseFiles(m, []string{fnames})
err = m.Close()
if err != nil {
fmt.Printf("error closing chain: %s\n", err)
}
}
func parseFiles(m *Markov, fnames []string) {
files := make([]*os.File, len(fnames))
for i, fname := range fnames {
f, err := os.Open(fname)
if err != nil {
fmt.Printf("failed to open file [%s]: %s\n", fname, err)
os.Exit(-1)
}
files[i] = f
}
for _, file := range files {
err := m.Parse(file)
if err != nil {
fmt.Printf("error parsing file [%s]: %s\n", file.Name(), err)
}
file.Close()
}
}